Mattel IntelliVision II 5872 Manuel d'utilisateur télécharger pdf (Page 205)

bits. To [1354]toggle or `invert' a bit is to change it, either from 0

to 1 or from 1 to 0. See also [1355]flag, [1356]trit, [1357]mode bit.

The term `bit' first appeared in print in the computer-science sense

in a 1948 paper by information theorist Claude Shannon, and was there

credited to the early computer scientist John Tukey (who also seems to

have coined the term `software'). Tukey records that `bit' evolved

over a lunch table as a handier alternative to `bigit' or `binit', at

a conference in the winter of 1943-44.

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Node:bit bang, Next:[1358]bit bashing, Previous:[1359]bit, Up:[1360]=

B =

bit bang n.

Transmission of data on a serial line, when accomplished by rapidly

tweaking a single output bit, in software, at the appropriate times.

The technique is a simple loop with eight OUT and SHIFT instruction

pairs for each byte. Input is more interesting. And full duplex (doing

input and output at the same time) is one way to separate the real

hackers from the [1361]wannabees.

Bit bang was used on certain early models of Prime computers,

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Mattel IntelliVision II 5872 Manuel d'utilisateur Page 205